CN115354351A - Electrolytic cell control device, electrolytic hydrogen production control system and method - Google Patents

Abstract

The application discloses electrolysis trough controlling means, electrolysis hydrogen manufacturing's control system and method, wherein, the device includes: a plurality of electrolysis cells, a plurality of first sensors, a plurality of second sensors, a plurality of third sensors, a plurality of fourth sensors, and a controller; the controller is used for determining a control strategy according to a fifth preset parameter input from the outside and the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter respectively acquired by the first sensor, the second sensor, the third sensor and the fourth sensor; the problem of unmatched supply and demand of renewable energy sources in the prior art is solved by arranging a plurality of electrolytic tanks; parameters acquired by the sensors can select and switch the electrolysis mode in real time in the electrolysis process so as to improve the transient response rate in the electrolysis process.

Description

Electrolytic cell control device, electrolytic hydrogen production control system and method

Technical Field

The invention relates to the field of hydrogen production, in particular to an electrolytic cell control device, and a control system and method for hydrogen production by electrolysis.

Background

Hydrogen is an energy carrier having both material properties and energy properties, and plays an important role in the fields of industrial production, electric energy carriers, electric synthetic fuels, heat supply and transportation. The alkaline point hydrolysis hydrogen production technology is commercialized at present and is widely applied to industrial steady-state hydrogen production.

At present, the alkaline electrolytic hydrogen production technology has the advantages of simple scheme, mature application and low cost, and has large-scale commercialized application prospect. In addition, a great deal of research shows that the main defects of the existing research of the alkaline water electrolysis hydrogen production system are shown in the following steps: on one hand, the existing electrolysis mode has the problem of poor transient response, and how to improve the transient response rate is the problem to be solved; on the other hand, under the demand of renewable energy, the installed demand of the electrolytic cell is large, and therefore, how to consider the comprehensive optimization of the system from the renewable energy system itself is an urgent need to be considered.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defects of poor transient response and unmatched energy supply and demand in the prior art, so as to provide an electrolytic cell control device, and a control system and method for hydrogen production by electrolysis.

In a first aspect, the present invention provides an electrolytic cell control apparatus comprising: the device comprises a plurality of electrolytic cells, a plurality of first sensors, a plurality of second sensors, a plurality of third sensors, a plurality of fourth sensors and a controller; after the first ends of the electrolysis baths are connected in a gathering way, a first transmission channel is formed and is connected with a first gas-liquid separator; after the second ends of the electrolysis baths are connected in a gathering way, a second transmission channel is formed and is connected with a second gas-liquid separator; the first sensors are respectively arranged at the first end and the second end of each electrolytic cell and used for collecting first preset parameters; the plurality of second sensors are respectively arranged on the first transmission channel and the second transmission channel and used for acquiring second preset parameters; the plurality of third sensors are respectively arranged at the tail ends of the first gas-liquid separator and the second gas-liquid separator and used for acquiring third preset parameters; the plurality of fourth sensors are respectively arranged at the tail ends of the first gas-liquid separator and the second gas-liquid separator and used for acquiring fourth preset parameters, and the third sensors and the fourth sensors are arranged at different positions; and the controller is used for determining a control strategy according to a fifth preset parameter, the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter which are input externally, and the control strategy is used for controlling the electrolysis mode of one or more of the plurality of electrolysis baths.

Through setting up a plurality of electrolysis baths in electrolysis trough controlling means, the unmatched problem of renewable energy's supply and demand among the prior art has been solved, it can match the electrolysis bath of corresponding quantity and carry out work according to renewable energy's supply volume to set up a plurality of electrolysis baths, the controller controls the electrolysis bath through the data information control electrolysis bath that a plurality of sensors that set up gathered and selects corresponding electrolysis mode, can carry out real time control and switching to the electrolysis mode of each electrolysis bath at the in-process of electrolysis bath work, with the transient response speed who improves among the electrolysis process, and then improve the whole response of system.

With reference to the first aspect, in a first embodiment of the first aspect, the first gas-liquid separator is a hydrogen-side gas-liquid separator, and the second gas-liquid separator is an oxygen-side gas-liquid separator.

With reference to the first aspect, in a second embodiment of the first aspect, the electrode area and the internal structure of each of the plurality of electrolytic cells are different.

With reference to the first aspect, in a third embodiment of the first aspect, the control policy includes two control policies, and the controller is configured to select one of the two control policies as a candidate policy according to a fifth preset parameter, and determine whether the first preset parameter, the second preset parameter, the third preset parameter, and the fourth preset parameter respectively belong to preset ranges corresponding to the first preset parameter, the second preset parameter, the third preset parameter, and the fourth preset parameter respectively on the premise of the candidate policy; when the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter all belong to respective corresponding preset ranges in the candidate strategies, the controller controls the electrolytic cell to select the candidate strategies as final execution strategies; or when any one of the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter does not belong to the corresponding preset range in the candidate strategies, the controller controls the electrolytic cell to select another control strategy except the candidate control strategy from the two control strategies as a final execution strategy.

The controller controls the electrolytic cells to select corresponding electrolysis modes through data information acquired by the plurality of sensors, and can control and switch the electrolysis modes of the electrolytic cells in real time in the working process of the electrolytic cells so as to improve the transient response rate in the electrolysis process and further improve the overall response of the system.

In a second aspect, the invention provides a control system for hydrogen production by electrolysis, which is characterized by comprising an electrolysis bath control device, a first gas-liquid separator and a second gas-liquid separator as described in any one of the above inventions; the first gas-liquid separator is connected with the electrolytic bath control device, and the second gas-liquid separator is connected with the electrolytic bath control device; the electrolytic cell control device is used for electrolyzing the electrolyte solution in one or more electrolytic cells according to the control strategy determined in any one of the invention contents to generate a hydrogen-containing mixture and an oxygen-containing mixture; the first gas-liquid separator is used for carrying out gas-liquid separation on the hydrogen-containing mixture and discharging hydrogen; the second gas-liquid separator is used for carrying out gas-liquid separation on the oxygen-containing mixture and discharging oxygen.

In combination with the second aspect, in a first embodiment of the second aspect, the system further comprises: the first purification device is connected with the first gas-liquid separator and is used for removing impurities contained in the hydrogen discharged by the first gas-liquid separator; and the second purifying device is connected with the second gas-liquid separator and is used for removing impurities contained in the oxygen discharged by the second gas-liquid separator.

Through setting up vapour and liquid separator, be convenient for go out the alkaline electrolyte solution of doping in the gas that electrolytic hydrogen production system put, realize preliminary edulcoration effect to improve the purity of the gas of putting.

In a second embodiment of the second aspect, in combination with the second aspect, the first purification device comprises: a first scrubber and a first cooler; the first scrubber is arranged at the tail end of the first gas-liquid separator, and the first cooler is arranged at the tail end of the first scrubber; the first scrubber is used for scrubbing impurities contained in the hydrogen discharged by the first gas-liquid separator to obtain hydrogen with the purity higher than a first threshold value; the first cooler is used for cooling and outputting hydrogen with purity higher than a first threshold value.

Through the first purification device, other impurities contained in the hydrogen separated from the gas-liquid separator can be removed conveniently, so that further purification is realized, and the output gas has higher purity.

In a third embodiment of the second aspect, in combination with the second aspect, a second purification apparatus comprises: a second scrubber and a second cooler; the second scrubber is arranged at the tail end of the second gas-liquid separator, and the second cooler is arranged at the tail end of the second scrubber; the second scrubber is used for scrubbing impurities contained in the oxygen discharged by the second gas-liquid separator to obtain the oxygen with the purity higher than the first threshold value; the second cooler is for cooling and outputting oxygen having a purity above a first threshold.

Through the second purification device, other impurities contained in the oxygen separated from the gas-liquid separator can be conveniently removed, so that further purification can be realized, and the output gas has higher purity.

In a third aspect, the present invention provides a method of controlling an electrolytic cell, comprising: acquiring a first preset parameter, a second preset parameter, a third preset parameter, a fourth preset parameter and a fifth preset parameter; and determining the control strategy of the electrolytic cell according to the first preset parameter, the second preset parameter, the third preset parameter, the fourth preset parameter and the fifth preset parameter.

In a fourth aspect, the invention provides a control method for hydrogen production by electrolysis, which is applied to the control system as described in the invention, wherein the control system comprises an electrolytic bath control device, a first gas-liquid separator and a second gas-liquid separator; the first gas-liquid separator is connected with the electrolytic bath control device, and the second gas-liquid separator is connected with the electrolytic bath control device; the electrolytic cell control device carries out electrolysis on the electrolyte solution in one or more electrolytic cells according to the determined control strategy to generate a hydrogen-containing mixture and an oxygen-containing mixture; the first gas-liquid separator performs gas-liquid separation on the hydrogen-containing mixture and discharges hydrogen; the second gas-liquid separator performs gas-liquid separation on the oxygen-containing mixture and discharges oxygen.

The method utilizes a plurality of electrolysis baths and selects a proper control strategy to carry out electrolytic hydrogen production, solves the problem of poor transient response in the prior art, and improves the transient response rate in the electrolysis process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of an electrolysis control apparatus according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating an example of an internal structure of an electrolytic cell according to an embodiment of the present invention;

FIG. 3 is a schematic control flow chart of a controller of the electrolytic cell control device according to the embodiment of the present invention;

FIG. 4 is a schematic connection diagram of a control system for hydrogen production by electrolysis provided by an embodiment of the invention;

FIG. 5 is a diagram of an example of a control system for hydrogen production by electrolysis according to an embodiment of the present invention;

FIG. 6 is a flow chart of a method of controlling an electrolytic cell according to an embodiment of the present invention;

fig. 7 is a flowchart of a control method for hydrogen production by electrolysis according to an embodiment of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides an electrolytic cell control device, as shown in figure 1, comprising:

a plurality of electrolysis cells, a plurality of first sensors, a plurality of second sensors, a plurality of third sensors, a plurality of fourth sensors, and a controller; after the first ends of the electrolytic tanks are connected in a gathering way, a first transmission channel is formed and is connected with a first gas-liquid separator; and the second ends of the electrolysis baths form a second transmission channel after being connected in a gathering way, and the second transmission channel is connected with the second gas-liquid separator.

In an optional embodiment, the electrolytic cell control device can be used for connecting a plurality of electrolytic cell cathodes after being gathered together through a hydrogen outlet pipe when hydrogen is produced by electrolyzing water, and the hydrogen outlet pipe is connected with the first gas-liquid separator, wherein the cathode is the first end of the electrolytic cell, and the hydrogen outlet pipe is the first transmission channel; the anodes of the plurality of electrolytic tanks are gathered and then connected through an oxygen outlet pipe, and the oxygen outlet pipe is connected with the second gas-liquid separator, wherein the anodes are the second ends of the electrolytic tanks, and the oxygen outlet pipe is the second transmission channel; in the electrolytic cell control device, the number of electrolytic cells is at least two.

In another optional embodiment, the electrolytic cell control device can also be used for electrolyzing sodium chloride solution, and at the moment, the electrolytic cell control device is formed by collecting cathodes of a plurality of electrolytic cells and then connecting the cathodes with a chlorine outlet pipe, wherein the chlorine outlet pipe is connected with a chlorine side gas-liquid separator, the cathodes are the first ends of the electrolytic cells, and the chlorine outlet pipe is the first transmission channel; the anodes of the plurality of electrolytic cells are gathered and then connected through a hydrogen outlet pipe, the hydrogen outlet pipe is connected with a hydrogen side gas-liquid separator, the anodes are the second ends of the electrolytic cells, the hydrogen outlet pipe is the second transmission channel, and similarly, in the electrolytic cell control device, the number of the electrolytic cells is at least two.

Specifically, the number of the electrolytic cells can be flexibly adjusted according to the capacity of the fan, and the operating power of each electrolytic cell can be determined according to the capacity of the fan; for example, assuming that the capacity of one fan is 2MW and the lower limit of the operation range of each device is 20%, it can be determined that:

the power of the first electrolytic cell was: 2MW (1-0.2) =1.6MW.

The power of the second cell was (2-1.6) MW (1-0.2) =0.32MW.

The power of the third cell was (2-1.6-0.32) MW (1-0.2) =0.064MW =64kw.

The power of the fourth electrolytic cell is (2-1.6-0.32-0.064) MW (1-0.2) =0.0128MW =12.8kW.

The power of the fifth electrolytic cell is (2-1.6-0.32-0.064-0.0128) MW (1-0.2) =0.004MW =4kW.

The power of the sixth electrolytic cell is (2-1.6-0.32-0.064-0.0128-0.004) MW (1-0.2) =0.0008MW =800w.

When the power of the electrolytic cells is calculated to be in the range of 0-1kW, the distribution of the number of the electrolytic cells can be stopped, for example, in the embodiment, the power of the sixth electrolytic cell is 800W, the power is in the range of 0-1kW, and the electrolytic cells do not need to be added, namely, when the fan capacity is 2MW, 6 electrolytic cells are mixed and connected, and in the electrolytic process, each electrolytic cell runs under the corresponding power.

Meanwhile, the number of the electrolytic cells can be set according to the average distribution principle, for example, assuming that the fan capacity is 100MW and the power of each electrolytic cell is 5MW, 20 electrolytic cells are required to operate simultaneously.

Further optionally, each electrolytic cell is provided with an electrolyte solution inlet, an electrolyte solution pipe is connected to the electrolyte solution inlet, the electrolyte solution pipes of a plurality of electrolytic cells are connected to the electrolyte solution manifold, an electrolyte solution pump delivers the electrolyte solution to the electrolyte solution cooler for cooling, and the cooled electrolyte solution flows into the electrolyte solution pipe connected to each electrolytic cell through the electrolyte solution manifold to provide the alkaline electrolyte solution for each electrolytic cell, a regulating valve is provided on the electrolyte solution pipe connected to each electrolytic cell, the amount of the alkaline electrolyte solution can be controlled by opening and closing the regulating valve, and a flow sensor is installed on the electrolyte solution pipe of each electrolytic cell for collecting flow data of the electrolyte solution.

The first sensors are respectively arranged at the first end and the second end of each electrolytic cell and used for collecting first preset parameters.

In an alternative embodiment, the first sensor may be a temperature sensor, which is respectively installed on the cathode and the anode of each electrolytic cell and is used for collecting the temperature corresponding to each electrode in the electrolytic process.

The plurality of second sensors are respectively arranged on the first transmission channel and the second transmission channel and used for acquiring second preset parameters.

In an alternative embodiment, the second sensor may be a pressure sensor, respectively installed on the hydrogen outlet pipe and the oxygen outlet pipe, for collecting the pressure value in the electrolysis process.

The plurality of third sensors are respectively arranged at the tail end of the first gas-liquid separator and the tail end of the second gas-liquid separator and used for acquiring third preset parameters.

In an alternative embodiment, the third sensor may be a liquid level sensor, and the liquid level sensor is respectively installed at the ends of the first gas-liquid separator and the second gas-liquid separator and is used for collecting liquid level data in the first gas-liquid separator and the second gas-liquid separator.

In an optional embodiment, one or more third sensors can be arranged, a plurality of sensors are arranged at the tail end of the first gas-liquid separator, and after one sensor fails, the other sensors can be used for collecting third preset parameters conveniently, so that the electrolytic tank control device can still work normally and accurately.

The plurality of fourth sensors are respectively arranged at the tail end of the first gas-liquid separator and the tail end of the second gas-liquid separator and used for acquiring fourth preset parameters, and the third sensors and the fourth sensors are arranged at different positions.

In an alternative embodiment, the fourth sensor may be a gas content measurement sensor, and is installed at the end of the first gas-liquid sensor and the end of the second gas-liquid sensor, in this embodiment, the gas content measurement sensor includes a hydrogen-in-oxygen content measurement sensor and a hydrogen-in-oxygen content measurement sensor, the hydrogen-in-hydrogen content measurement sensor may be installed at the end of the first gas-liquid separation sensor, the hydrogen-in-oxygen content measurement sensor may be installed at the end of the second gas-liquid separation sensor, the installation position of the gas content measurement sensor is different from that of the liquid level sensor, the hydrogen-in-oxygen content measurement sensor is used for collecting the content of hydrogen mixed in the collected oxygen, and the hydrogen-in-oxygen content measurement sensor is also used for collecting the content of oxygen mixed in the collected hydrogen, so the fourth preset parameter may be the hydrogen content in oxygen or the oxygen content in hydrogen.

Specifically, one or more fourth sensors can be arranged, a plurality of fourth sensors are arranged at the tail end of the second gas-liquid separator, and after one fourth sensor fails, the plurality of fourth sensors can continue to acquire fourth preset parameters by using the rest of the fourth sensors, so that the electrolytic tank control device can still work normally and accurately.

And the controller is used for determining a control strategy according to a fifth preset parameter, the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter which are input externally, and the control strategy is used for controlling the electrolysis mode of one or more of the plurality of electrolysis baths.

In an alternative embodiment, the fifth parameter is an externally input power change rate, the input power change rate is calculated based on the input power at two adjacent moments and the time interval, and the controller controls the electrolytic cell to select the electrolysis strategy at the current moment according to the input power change rate and the temperature, the pressure, the liquid level and the hydrogen content in the oxygen acquired by the plurality of sensors.

The problem that the supply and demand of renewable energy sources are not matched in the prior art is solved by arranging the plurality of electrolytic cells in the electrolytic cell control device, the electrolytic cells with the corresponding number can be matched to work according to the supply quantity of the renewable energy sources, the electrolysis mode of the electrolytic cells is controlled by a control strategy, and the electrolysis mode of the electrolytic cells can be controlled and switched in real time according to the parameters acquired by the sensors in the working process of the electrolytic cells so as to improve the transient response rate in the electrolysis process

In an alternative embodiment, the first gas-liquid separator is a hydrogen-side gas-liquid separator and the second gas-liquid separator is an oxygen-side gas-liquid separator.

In an alternative embodiment, the electrode area and the internal structure of each of the plurality of cells are different.

Illustratively, as shown in fig. 2, the electrolytic cell control device is formed by mixing and connecting four electrolytic cells, the electrode area and the internal structure of each electrolytic cell are different, and the internal structure comprises the number of electrode plates and the connection mode between the electrodes; for example, the electrode in the electrolytic cell 1 is a positive electrode and a negative electrode, the electrode has a single electrode plate, the electrode area is A, the electrode in the electrolytic cell 2 is a positive electrode and a negative electrode, the electrode area is A, the electrode in the electrolytic cell 3 is a positive electrode and a negative electrode, the electrode area is B, the electrode in the electrolytic cell 4 is a positive electrode and a negative electrode, the electrode area is B, and the electrode area is 6.

In an optional embodiment, the control strategies include two control strategies, the controller is configured to select one of the two control strategies as a candidate strategy according to a fifth preset parameter, and determine whether the first preset parameter, the second preset parameter, the third preset parameter, and the fourth preset parameter respectively belong to respective corresponding preset ranges on the premise of the candidate strategy; when the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter all belong to the corresponding preset ranges in the candidate strategies, the controller controls the electrolytic cell to select the candidate strategies as final execution strategies; or when any one of the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter does not belong to the preset range corresponding to each of the candidate strategies, the controller controls the electrolytic cell to select another control strategy except the candidate control strategy from the two control strategies as a final execution strategy.

Illustratively, there are two control strategies, i.e., control voltage, current feedback, and control current, voltage feedback, for example, for an electrolyzer; in each control strategy, the corresponding ranges of the input power change rate, the temperature, the pressure, the liquid level and the hydrogen content in the oxygen exist, for example, in the electrolysis strategy of controlling voltage and current feedback, the corresponding ranges of the parameters are that the input power change rate is more than 5%/s, the temperature is between 85.5 and 94.5 ℃, the pressure is between 15.2 and 16.8bar, the hydrogen content in the oxygen is less than 2 percent, and the liquid level height is between 45 and 55 percent; in the electrolysis strategy for controlling current and voltage feedback, the corresponding ranges of the parameters are that the input power change rate is less than or equal to 5%/s, the temperature is less than 85.5 degrees or more than 94.5 degrees, the pressure is less than 15.2bar or more than 16.8bar, the hydrogen content in oxygen is more than or equal to 2%, and the liquid level height is less than 45% or more than 55%.

Illustratively, if a set of data acquired at a certain time is that the input power change rate is 8% per second, the temperature is 87 ℃, the pressure is 17bar, the hydrogen content in oxygen is 3%, and the liquid level height is 40%, the controller analyzes and judges the five parameters, firstly, the input power is determined to be 8% per second within the range of the control voltage and the current feedback control strategy according to the input power change rate, so that the control voltage and the current feedback are taken as candidate strategies, then, whether the temperature, the pressure, the hydrogen content in oxygen and the liquid level height are within the range of each parameter corresponding to the candidate strategies is continuously judged, the pressure and the hydrogen content in oxygen are judged to be out of the range corresponding to the candidate strategies, at this time, another strategy except the candidate strategies is selected as a finally selected control strategy, namely, the electrolytic cell is controlled to select the control current, and the voltage feedback control strategy is taken as a finally selected strategy.

Illustratively, if a group of data acquired at a certain time is that the input power change rate is 8% per second, the temperature is 87 ℃, the pressure is 16bar, the hydrogen content in oxygen is 1.2%, and the liquid level height is 40%, the controller analyzes and judges the five parameters, firstly, the input power is determined to be 8% per second within the range of the control voltage and the current feedback control strategy according to the input power change rate, so that the control voltage and the current feedback are taken as candidate strategies, further, whether the temperature, the pressure, the hydrogen content in oxygen and the liquid level height are within the range of each parameter corresponding to the candidate strategies is continuously judged, the temperature, the pressure, the hydrogen content in oxygen and the liquid level height are all determined to be within the range corresponding to the candidate strategies, at this time, the candidate strategies are taken as finally selected control strategies, namely, the control voltage is selected by controlling the electrolytic cell, and the current feedback control strategies are taken as the finally selected strategies.

Exemplarily, as shown in fig. 3, the controller pre-selects a Control strategy according to an input power change rate input from the outside, selects a candidate strategy, transmits the obtained hydrogen content in oxygen, pressure, temperature, and liquid level height to mathematical software Matlab through OPC (OLE for Process Control) communication 1, determines the ranges of the hydrogen content in oxygen, pressure, temperature, and liquid level height and the parameters corresponding to the candidate strategy by Matlab, generates a corresponding electrolysis mode selection command according to the determination result, and sends a selection command to Control the electrolysis cell to perform final selection of the electrolysis mode according to Matlab by OPC-communication 2.

The parameters acquired by a plurality of different sensors in real time in the electrolytic cell control device are convenient for controlling and switching the electrolysis mode of the electrolytic cell in real time according to the currently actually acquired parameters, the problem of poor transient response in the prior art is solved, and the transient response rate of the electrolysis mode is improved

The invention provides a control system for electrolytic hydrogen production, which comprises: the electrolytic bath control device, the first gas-liquid separator and the second gas-liquid separator; the first gas-liquid separator is connected with the electrolytic bath control device, and the second gas-liquid separator is connected with the electrolytic bath control device; the electrolytic cell control device is used for electrolyzing the electrolyte solution in one or more electrolytic cells according to the control strategy determined in any one of the above embodiments to generate a hydrogen-containing mixture and an oxygen-containing mixture; the first gas-liquid separator is used for carrying out gas-liquid separation on the hydrogen-containing mixture and discharging hydrogen; the second gas-liquid separator is used for carrying out gas-liquid separation on the oxygen-containing mixture and discharging oxygen.

Exemplarily, as shown in fig. 4, the electrolytic hydrogen production control system is an exemplary diagram of the electrolytic hydrogen production control system, wherein the electrolytic cell control device is formed by connecting a plurality of electrolytic cells through a hydrogen outlet pipe, an oxygen outlet pipe and a lye main pipe, and each electrolytic cell is connected with a respective power supply for determining the opening and closing of the electrolytic cell according to the actual electrolysis condition; wherein the hydrogen outlet pipe is connected with the hydrogen side gas-liquid separator, the oxygen outlet pipe is connected with the oxygen side gas-liquid separator, and the regulating valves are respectively arranged at the tail ends of the hydrogen side gas-liquid separator and the oxygen side gas-liquid separator and used for controlling the output flow of the gas.

Illustratively, as shown in fig. 5, in the electrolytic hydrogen production control system, sensors are mounted at the front and the rear of each component, the sensors correspond to black hollow circles and solid circles in the figure, the sensors are used for collecting corresponding data in the electrolytic process, and the mounted sensors have flow sensors which can be used for collecting the flow of the alkali liquor flowing into the electrolytic bath or the flow of the cooling water flowing into the cooler and the like; the inspection voltage sensor is used for collecting the voltage of each small chamber in the electrolytic cell and the like, one part of data collected by the sensor is used for controlling the controller to control the electrolytic cell to select an electrolysis mode, and the other part of the data is used as a parameter for monitoring whether the system normally operates or not, so that the performance and the safety of the whole electrolytic hydrogen production system are dynamically detected.

Illustratively, the electrolytic hydrogen production control system can be connected to the monitoring platform, can upload the multiple data that a plurality of sensors gathered to the monitoring platform, and the monitoring platform can be through the monitoring and the analysis to multiple data, when monitoring unusual data, can link alarm module and send out unusual warning.

The plurality of sensors are arranged in the electrolytic hydrogen production system, so that the electrolytic hydrogen production process can be monitored in real time, and when abnormality exists, the abnormal condition can be conveniently and timely treated, and the safety of the whole system is improved.

In an alternative embodiment, as shown in fig. 5, the present invention provides a control system for hydrogen production by electrolysis, further comprising: the first purification device is connected with the first gas-liquid separator and is used for removing impurities contained in the hydrogen discharged by the first gas-liquid separator; and the second purifying device is connected with the second gas-liquid separator and is used for removing impurities contained in the oxygen discharged by the second gas-liquid separator.

Through setting up vapour and liquid separator, be convenient for go out the alkaline electrolyte solution of doping in the gas that electrolytic hydrogen production system put, realize preliminary edulcoration effect to improve the purity of the gas of putting.

In an alternative embodiment, as shown in fig. 5, a first purification apparatus comprises: a first scrubber and a first cooler; the first scrubber is arranged at the tail end of the first gas-liquid separator, and the first cooler is arranged at the tail end of the first scrubber; the first scrubber is used for scrubbing impurities contained in the hydrogen discharged by the first gas-liquid separator to obtain hydrogen with the purity higher than a first threshold value; the first cooler is used for cooling and outputting hydrogen with purity higher than a first threshold value.

For example, the first scrubber may be used to remove an alkaline solution such as a potassium hydroxide solution from the hydrogen gas discharged from the first gas-liquid separator, i.e., the hydrogen-side gas-liquid separator, to obtain hydrogen gas having a purity higher than a preset threshold, which may be 98%.

Illustratively, the first cooler is used for cooling the hydrogen with purity higher than 98% obtained from the first scrubber, for example, the operation temperature of the electrolytic cell is 90 degrees, and the temperature of the hydrogen outlet is 30 degrees, so that the output hydrogen with the purity of 90 degrees needs to be cooled to 30 degrees or below for output.

Through the first purification device, other impurities contained in the hydrogen separated from the gas-liquid separator can be conveniently removed, so that further purification can be realized, and the output gas has higher purity.

In an alternative embodiment, the second purifying means comprises: a second scrubber and a second cooler; the second scrubber is arranged at the tail end of the second gas-liquid separator, and the second cooler is arranged at the tail end of the second scrubber; the second scrubber is used for scrubbing impurities contained in the oxygen discharged by the second gas-liquid separator to obtain the oxygen with the purity higher than the first threshold value; the second cooler is for cooling and outputting oxygen having a purity above a first threshold.

For example, the second scrubber may be used to remove an alkaline solution such as a potassium hydroxide solution from the oxygen gas discharged from the second gas-liquid separator, i.e., the oxygen-side gas-liquid separator, to obtain oxygen gas having a purity higher than a preset threshold.

Through the second purification device, other impurities contained in the hydrogen separated from the gas-liquid separator can be conveniently removed, so that further purification can be realized, and the output gas has higher purity.

The invention provides an electrolytic cell control method, as shown in figure 6, comprising the following steps:

step S11: the method comprises the steps of obtaining a first preset parameter, a second preset parameter, a third preset parameter, a fourth preset parameter and a fifth preset parameter, wherein the first preset parameter, the second preset parameter, the third preset parameter, the fourth preset parameter and the fifth preset parameter can be temperature, pressure, hydrogen content in oxygen, liquid level height and input power change rate.

Step S12: determining control strategies of the electrolytic cell according to the first preset parameter, the second preset parameter, the third preset parameter, the fourth preset parameter and the fifth preset parameter, wherein the control strategies can be two, namely voltage control, current feedback or current control and voltage feedback.

In an optional embodiment, the control strategy of the electrolytic cell is determined according to a first preset parameter, a second preset parameter, a third preset parameter, a fourth preset parameter and a fifth preset parameter, and the control strategy includes two control strategies, including:

selecting one strategy from the two control strategies as a candidate strategy according to a fifth preset parameter, and judging whether the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter respectively belong to preset ranges corresponding to the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter respectively on the premise of the candidate strategy; when the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter all belong to the corresponding preset ranges in the candidate strategies, the controller controls the electrolytic cell to select the candidate strategies as final execution strategies; or when any one of the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter does not belong to the preset range corresponding to each of the candidate strategies, the controller controls the electrolytic cell to select another control strategy except the candidate control strategy from the two control strategies as a final execution strategy.

The specific details of the execution of each method step in the method for controlling an electrolytic cell provided by the embodiment of the present invention have been described in detail in any of the above-mentioned apparatus embodiments, and therefore, the details are not described herein again.

The invention provides a control method for hydrogen production by electrolysis, which is applied to an electrolytic cell control system introduced in any one of the above embodiments, wherein the control system comprises an electrolytic cell control device introduced in any one of the above embodiments, and a first gas-liquid separator and a second gas-liquid separator; the first gas-liquid separator is connected with the electrolytic bath control device, and the second gas-liquid separator is connected with the electrolytic bath control device.

As shown in fig. 7, the method includes the steps of:

step S21: the electrolytic cell control device carries out electrolysis on the electrolyte solution in one or more electrolytic cells according to the determined control strategy to generate a hydrogen-containing mixture and an oxygen-containing mixture;

step S22: the first gas-liquid separator performs gas-liquid separation on the hydrogen-containing mixture and discharges hydrogen;

step S23: the second gas-liquid separator performs gas-liquid separation on the oxygen-containing mixture and discharges oxygen.

The specific details of the implementation of each method step in the electrolytic hydrogen production control method provided by the invention have been described in detail in any system embodiment, and therefore, the details are not described herein again.

The method utilizes a plurality of electrolytic tanks and selects a proper control strategy to carry out electrolytic hydrogen production, solves the problem of poor transient response in the prior art, and improves the transient response rate in the electrolytic process.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. An electrolytic cell control apparatus, comprising:

the apparatus comprises a plurality of electrolysis cells, a plurality of first sensors, a plurality of second sensors, a plurality of third sensors, a plurality of fourth sensors, and a controller; after the first ends of the electrolysis baths in the plurality of electrolysis baths are connected in a gathering way, a first transmission channel is formed and is connected with a first gas-liquid separator; after the second ends of the electrolysis baths in the plurality of electrolysis baths are connected in a gathering way, a second transmission channel is formed and is connected with a second gas-liquid separator;

the first sensors are respectively arranged at the first end and the second end of each electrolytic cell and used for collecting first preset parameters;

the plurality of second sensors are respectively arranged on the first transmission channel and the second transmission channel and used for acquiring second preset parameters;

the plurality of third sensors are respectively arranged at the tail ends of the first gas-liquid separator and the second gas-liquid separator and used for acquiring third preset parameters;

the plurality of fourth sensors are respectively arranged at the tail ends of the first gas-liquid separator and the second gas-liquid separator and used for acquiring fourth preset parameters, and the third sensors and the fourth sensors are arranged at different positions;

the controller is used for determining a control strategy according to a fifth preset parameter input from the outside, the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter, wherein the control strategy is used for controlling the electrolysis mode of one or more of the plurality of electrolysis cells.

2. The electrolyzer control apparatus of claim 1 wherein the first gas-liquid separator is a hydrogen-side gas-liquid separator and the second gas-liquid separator is an oxygen-side gas-liquid separator.

3. The electrolytic cell control apparatus according to any one of claims 1 or 2, wherein an electrode area and an internal structure of each of the plurality of electrolytic cells are different from each other.

4. The electrolyzer control apparatus of claim 1 or 2, characterized in that the control strategies comprise two control strategies, and the controller is configured to select one of the two control strategies as a candidate strategy according to the fifth preset parameter, and determine whether the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter respectively belong to respective corresponding preset ranges on the premise of the candidate strategy;

when the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter all belong to the preset ranges corresponding to the candidate strategies, the controller controls the electrolytic cell to select the candidate strategies as final execution strategies;

or, when any one of the first preset parameter, the second preset parameter, the third preset parameter and the fourth preset parameter does not belong to the preset range corresponding to each of the candidate strategies, the controller controls the electrolytic cell to select another control strategy except the candidate control strategy as a final execution strategy from the two control strategies.

5. A control system for electrolytic hydrogen production, comprising the electrolytic cell control device according to any one of claims 1 to 4, the first gas-liquid separator, and the second gas-liquid separator; the first gas-liquid separator is connected with the electrolytic tank control device, and the second gas-liquid separator is connected with the electrolytic tank control device;

the electrolyzer control means are used for electrolyzing the electrolyte solution in one or more electrolyzers to generate a hydrogen-containing mixture and an oxygen-containing mixture according to the control strategy determined according to any one of claims 1-4;

the first gas-liquid separator is used for carrying out gas-liquid separation on the hydrogen-containing mixture and discharging hydrogen;

the second gas-liquid separator is used for carrying out gas-liquid separation on the oxygen-containing mixture and discharging oxygen.

6. A control system for electrolytic hydrogen production according to claim 5, further comprising:

a first purification device connected to the first gas-liquid separator, for removing impurities contained in the hydrogen gas discharged from the first gas-liquid separator;

and the second purification device is connected with the second gas-liquid separator and is used for removing impurities contained in the oxygen discharged by the second gas-liquid separator.

7. The control system for electrolytic hydrogen production according to claim 6, wherein the first purification device includes: a first scrubber and a first cooler;

the first scrubber is arranged at the tail end of the first gas-liquid separator, and the first cooler is arranged at the tail end of the first scrubber;

the first scrubber is used for scrubbing impurities contained in the hydrogen discharged by the first gas-liquid separator to obtain hydrogen with the purity higher than a first threshold value;

the first cooler is used for cooling and outputting the hydrogen with the purity higher than the first threshold value.

8. The control system for electrolytic hydrogen production according to claim 7, wherein the second purification device includes: a second scrubber and a second cooler;

the second scrubber is installed at the tail end of the second gas-liquid separator, and the second cooler is installed at the tail end of the second scrubber;

the second scrubber is used for scrubbing impurities contained in the oxygen discharged by the second gas-liquid separator to obtain oxygen with the purity higher than a first threshold value;

the second cooler is used for cooling and outputting the oxygen with the purity higher than the first threshold.

9. A method of controlling an electrolytic cell, comprising:

acquiring a first preset parameter, a second preset parameter, a third preset parameter, a fourth preset parameter and a fifth preset parameter;

and determining a control strategy of the electrolytic cell according to the first preset parameter, the second preset parameter, the third preset parameter, the fourth preset parameter and the fifth preset parameter.

10. A control method for electrolytic hydrogen production, characterized in that the method is applied to the control system according to claim 5, which includes the electrolyzer control device according to any one of claims 1 to 4, the first gas-liquid separator and the second gas-liquid separator; the first gas-liquid separator is connected with the electrolytic bath control device, and the second gas-liquid separator is connected with the electrolytic bath control device;

the electrolyzer control means electrolyzes the electrolyte solution in one or more electrolyzers to produce a hydrogen-containing mixture and an oxygen-containing mixture according to a control strategy determined according to any one of claims 1 to 4;

the first gas-liquid separator is used for carrying out gas-liquid separation on the hydrogen-containing mixture and discharging hydrogen;

the second gas-liquid separator performs gas-liquid separation on the oxygen-containing mixture and discharges oxygen.

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